Soil washing restoration system based on reduction concentration design concept and method thereof

Abstract

The invention discloses a soil washing restoration system based on a reduction concentration design concept and a method thereof. The washing restoration system comprises the following four module units which are sequentially connected with one another: a feeding and screening unit, an ore washing unit, a sludge dewatering unit and a tail-end sewage treatment recycling unit. The pollutants on the surface of coarse particles are eluted, transferred and concentrated into the filter-pressed mud cake by virtue of washing, so that pollutant-containing fine particles in contaminated soil can be effectively separated from crude particles such as gravel and grit. The repaired and discharged clean gravel and grit can be directly recycled to serve as building material. According to the system, purified water serves as a washing solution, so that secondary pollution caused by addition of a chemical washing agent is avoided, and the washing solution is treated by a tail-end sewage treatment system so as to be recycled. The reduction of remediation of contaminated soil is realized, the comprehensive repair cost is greatly reduced, the washed and discharged materials can be recycled, the contaminated soil is repaired, and a novel profit point is created.

Description

technical field [0001] The invention relates to soil remediation technology, in particular to the leaching and remediation of polluted soil with high coarse particle content, and in particular to a soil leaching and remediation system and method based on the design concept of reduction and concentration. Background technique [0002] According to the National Soil Pollution Survey Bulletin jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources, the area of ​​polluted soil in my country is as high as 16%. will become increasingly prominent. In particular, a large number of decommissioned industrial sites are generated during the process of "retreating from the second to the third" and "retreating from the city to enter the park". These sites often occupy valuable positions in the city, and with the advancement of urbanization, they will become commercial sites in the future. However, most decommissioned industrial sites have serious...

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Problems solved by technology

So far, there is no successful case of soil leaching engineering application in China, and most of the developed soil leaching technologies and equipment are aimed at laboratory or pilot-scale research.

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